JOINing on tables with missing rows

Question

Given this DDL:
CREATE TABLE #Events
    EventID INT,
    BallroomCharge NUMERIC(10,2)
INSERT INTO #Events VALUES (1001, 10)
INSERT INTO #Events VALUES (1002, 25)
CREATE TABLE #EventFacility
    EventID INT,
    FacilityID int,
    ServiceCharge NUMERIC(10,2)
INSERT INTO #EventFacility VALUES (1001, 1, 100)
INSERT INTO #EventFacility VALUES (1001, 2, 110)
INSERT INTO #EventFacility VALUES (1001, 3, 120)
INSERT INTO #EventFacility VALUES (1002, 1, 200)
INSERT INTO #EventFacility VALUES (1002, 2, 210)
CREATE TABLE #Facility
    FacilityID int,
    FacilityName VARCHAR(10)
INSERT INTO #Facility VALUES (1, 'Main Hall')
INSERT INTO #Facility VALUES (2, 'Theatre')
INSERT INTO #Facility VALUES (3, 'BallRoom')
For each event, there may be multiple related facilities. However, not all events will have all facilities. However, one of the facilities (Ballroom) has a charge which must be applied whether a Ballroom is attached to the event or not. The data set returned
should look like this:
EventID   FacilityID   Total
1001      1            100
1001      2            110
1001      3            130 (120 + 10 from the Events.Ballroom charge)
1002      1            200
1002      2            210
1002      3              25 (No Ballroom entry but 25 from the Events.Ballroom charge)
The problem is that I can't get the last row to appear as there is no matching entry in the EventFacility table.
My SQL so far (which doesn't work) is here:
WITH MyCTE(EventID, FacilityID, ServiceCharge, FacilityName)
AS
    SELECT ef.EventID, f.FacilityID, ef.ServiceCharge, f.FacilityName
    FROM #EventFacility ef
    INNER JOIN #Facility f ON ef.FacilityID = f.FacilityID
SELECT e.EventID,
c.FacilityID,
c.FacilityName,
ISNULL(c.ServiceCharge, 0) + e.BallroomCharge AS Total
FROM #Events e
LEFT OUTER JOIN MyCTE c ON c.EventID = c.EventID
WHERE e.EventID IN (1001, 1002)
AND c.FacilityID = 3
Any ideas as to how I would go about doing this?

Answer 1

a Very small change to the query if you want to add the BallroomCharge column, only for the BallRoom and not to all rows:
select E.EventID, F.FacilityID, (case when F.FacilityID = 3 then E.BallroomCharge else 0 end) + ISNULL(EF.ServiceCharge,0)
from #Events E
CROSS JOIN #Facility F
left JOIN #EventFacility EF ON E.EventID = EF.EventID and F.FacilityID = EF.FacilityID
  Ronen Ariely
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